Below is an example of an event email template (the Email Notification to the event host when a guest RSVPs) to punch in to the UserProfile of the guest and to the event detail page:
Hi [ToUser:FirstName],
<p>
<a href="http://www.pokerdiy.com/Home/PokerPlayerProfile/tabid/391/ID/[User:UserID]/Default.aspx">[User:DisplayName]</a> has said <b>[EventUser:EventRSVPText]</b> to your event, "<a href=[Event:EventDetail]>[Event:EventName]</a>" on [Portal:PortalName], due to the following:
<br>
[EventUser:Comment]<br />[EventUser:CommentHost]
<p>
You can see a summary of RSVP's for your event <a href=[Event:EventDetail]>here</a>
<p>
Yours Sincerely
<br />The [Portal:PortalName] crew
<br /><a href=http://[Portal:URL]>http://[Portal:URL]</a>